Combustion-type power tool

Internal-combustion engines – Adjustable combustion chamber – Piston in head adjusted

Reexamination Certificate

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Details

C123S0460SC

Reexamination Certificate

active

11274323

ABSTRACT:
A combustion-type power tool includes a cylinder and a combustion chamber disposed on top of the cylinder that accommodates a gaseous mixture of existing air in the combustion chamber and fuel injected therein. A spark plug generates a spark to combust the gaseous mixture in the combustion chamber. A trigger switch produces the spark in the spark plug when operated. A piston is movably supported in the cylinder and driven by combustion in the combustion chamber. A driving blade is integrally formed with the piston for driving a fastener. A push lever is provided at one end of the housing and coupled with the combustion chamber frame. A temperature sensor is provided, for example, on the combustion chamber frame to sense the temperature thereof. A stopper is operated to adjust the position of the push lever to be shifted from an initial position when the sensed temperature is higher than a critical value. The push lever is positioned farther from another end of the housing when adjusted than when the push lever is in the initial position.

REFERENCES:
patent: 4403722 (1983-09-01), Nikolich
patent: 4483280 (1984-11-01), Nikolich
patent: 4483473 (1984-11-01), Wagdy
patent: 4483474 (1984-11-01), Nikolich
patent: 4522162 (1985-06-01), Nikolich
patent: RE32452 (1987-07-01), Nikolich
patent: 6968811 (2005-11-01), Rosenbaum
patent: 2006/0225675 (2006-10-01), Nishikawa et al.
patent: 1 459 850 (1984-11-01), None
patent: 64-9149 (1989-02-01), None
patent: 1-34753 (1989-07-01), None
patent: 3-25307 (1991-04-01), None
patent: 4-11337 (1992-02-01), None
patent: 4-48589 (1992-08-01), None
patent: 2004-314263 (2004-11-01), None

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